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Difficulty: EasyDriving in Adverse Weather and Low Visibility

You are driving on a two-lane road during a heavy rainstorm with standing water accumulated on the pavement. The posted speed limit is 45 mph. According to the basic speed law, what is the correct driving action under these conditions?

  1. Reduce your speed below 45 mph to a pace that is safe for the current traction and visibility conditions.Answer
  2. B
    Maintain the posted speed limit of 45 mph, because posted speed limits apply regardless of weather conditions.
  3. C
    Increase your speed slightly above 45 mph to pass through the standing water quickly before tires lose grip.
  4. D
    Drive at whatever speed the vehicle directly ahead of you is traveling, regardless of your safe stopping distance.

Answer

Reduce your speed below 45 mph to a pace that is safe for the current traction and visibility conditions.
Under the basic speed law, posted speed limits set the maximum speed under ideal conditions. When facing heavy rain and standing water, driving at a reduced speed is required to maintain traction and control.

Step-by-Step Solution

1
Evaluate the current road and weather conditions.
Heavy rain and standing water create hazards such as reduced traction, longer stopping distances, and hydroplaning risks.
Safe driving requires recognizing environmental factors that impair vehicle control.
2
Apply the basic speed law rule.
Recognize that the posted speed limit (45 mph) is valid only for ideal driving conditions.
The basic speed law states that you may never drive faster than is safe for present conditions.
3
Determine the appropriate driving speed.
Slow down below the posted limit to ensure full vehicle control and adequate stopping distance.
Reducing speed allows tires to displace water effectively and prevents traction loss.

Key Concept

Basic Speed Law in Adverse Weather
Estimated Time:45s
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Topics

Driving in Adverse Weather and Low Visibility

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